详解WPF如何显示具有层级关系的数据

 public class Class
 {
     public string? Name { get; set; }
     public List<Student>? Students { get; set; }
 }

 public class Student
 {
     public string? Name { get; set; }
 }

 private void Button_Click(object sender, RoutedEventArgs e)
 {
     Student student1 = new Student() { Name = "小明" };
     Student student2 = new Student() { Name = "小红" };
     Student student3 = new Student() { Name = "小黄" };
     Student student4 = new Student() { Name = "小绿" };
     Student student5 = new Student() { Name = "小刚" };

     List<Student> students1 = new List<Student>()
     {
         student1,
         student2,
         student3
     };

     List<Student> students2 = new List<Student>()
     {              
         student4,
         student5
     };

     Class class1 = new Class()
     {
         Name = "班级1",
         Students = students1
     };

     Class class2 = new Class()
     {
         Name = "班级2",
         Students = students2
     };

     List<Class> classes = new List<Class>()
     {
         class1,
         class2
     };

     DataContext = classes;

 }

  <TreeView>
      <TreeViewItem ItemsSource="{Binding}" Header="全部班级"/>
  </TreeView>

<Window.Resources>
    <HierarchicalDataTemplate DataType = "{x:Type local2:Class}"
       ItemsSource = "{Binding Path=Students}">
        <TextBlock Text="{Binding Path=Name}"/>
    </HierarchicalDataTemplate>

    <DataTemplate DataType="{x:Type local2:Student}">
        <TextBlock Text="{Binding Path=Name}"/>
    </DataTemplate>
</Window.Resources>